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Gen II larger tires, not wider?

Discussion in 'Gen 2 Prius Main Forum' started by rwernst, Nov 19, 2009.

  1. rwernst

    rwernst Junior Member

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    My odometer is off by about 5% reading high. I'm ready for new tires and wondered if I can go to a taller tire size and/or taller aspect ratio.

    2005 standard/base Prius with keyless entry thing. Stock alloy wheels, standard tires are 185-65x15, can I go to 195-65, or 185-70 (if I can find them)? Can I go larger?)?

    And yes, I know this will affect acceleration, but I'm not worried about that. I do NOT want to go wider as they tend to be more expensive (I'm on a budget), and usually will reduce my mpg.

    And I don't want to spend money on new wheels.

    Thanks!
     
    #1 rwernst, Nov 19, 2009
  2. brick

    brick Active Member

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    What are you basing your measurement on? When I compare my odometer readings to my GPS (Garmin) trip mileage after a couple hundred miles of driving the difference is negligible with the OEM tire size.
     
    #2 brick, Nov 20, 2009
  3. Patrick Wong

    Patrick Wong DIY Enthusiast

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    There are many tire size calculators on the web. Here's one:
    Tire Size Calculator - Discount Tire Direct

    Based upon that, you will see that the difference between 185/65R-15 and 195/65R-15 is ~2%. 185/70R-15 will be ~3% larger.

    Also, there's some variation between tire brands so not all 185/65R-15 will be exactly the same diameter and circumference.
     
    #3 Patrick Wong, Nov 20, 2009
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